Facts about the Universe

  • In 140 AD. Claudius Ptolemy propounded the theory that the earth was the center of the universe.
  • In 1543 Copernicus argued that the sun and not the earth was the center of the universe.
  • Kepler supported Copernicus but said that the sun was not the center of universe but the solar system.
  • In 1805, Herschel made it clear that the solar system was a part of a much larger system of stars called ‘galaxy ‘.
  • In 1925, Edwin P. Hubble pointed out that the universe actually consisted of millions of galaxies.
  • Galaxies are huge congregation of stars that hold together, e.g. the Milky way galaxy. Milky way galaxy is our home galaxy.
  • The sun takes 24 million year to complete one revolution around the Galactic nucleus, which is called a ‘galactic year’.
  • Stars are self luminous bodies that account for 98% of the matter in a galaxy.
  • Some matter appear small but emit more energy than the other stars of the milky way. Such stars are called ‘Quasars’.
  • When the dense galactic nucleus is compressing to form a star, this stage is called ‘protostar’.
  • Due to high temperature hydrogen converts to helium and heat and light are emitted.
  • When the hydrogen of a star is depleted, it’s outer regions swell and redden. this stage of a star is called ‘Red Giant’.
  • The sun will turn into a ‘Red Giant’ in 5 billion years.
  • ‘Novae’ are stars whose brightness suddenly increases by more than 20 magnitudes .
  • After the explosion, the dense core of the comparatively larger stars in called the ‘Newtron star’.
  • The Newtron star rotates at a high peed, emitting radio waves.
  • Such stars are called ‘Pulsar’.
  • Black hole’s stage of a star occurs when the ancient star collapses.

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